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package com.oracle.truffle.api.dsl.test;

import static com.oracle.truffle.api.dsl.test.TestHelper.createRoot;
import static com.oracle.truffle.api.dsl.test.TestHelper.executeWith;
import static org.junit.Assert.assertEquals;

import org.junit.Test;

import com.oracle.truffle.api.dsl.Fallback;
import com.oracle.truffle.api.dsl.NodeChild;
import com.oracle.truffle.api.dsl.NodeChildren;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.dsl.test.BinaryNodeTestFactory.AddNodeFactory;
import com.oracle.truffle.api.dsl.test.TypeSystemTest.TestRootNode;
import com.oracle.truffle.api.dsl.test.TypeSystemTest.ValueNode;

public class BinaryNodeTest {

    @Test
    public void testAdd() {
        TestRootNode<AddNode> node = createRoot(AddNodeFactory.getInstance());
        assertEquals(42, executeWith(node, 19, 23));
        assertEquals(42d, executeWith(node, 19d, 23d));
        assertEquals(42d, executeWith(node, "19", "23"));
        assertEquals(42, executeWith(node, 19, 23));
    }

    @Test(expected = RuntimeException.class)
    public void testAddUnsupported() {
        TestRootNode<AddNode> node = createRoot(AddNodeFactory.getInstance());
        executeWith(node, new Object(), new Object());
    }

    @NodeChildren({@NodeChild("left"), @NodeChild("right")})
    abstract static class BinaryNode extends ValueNode {
    }

    abstract static class AddNode extends BinaryNode {

        @Specialization
        int add(int left, int right) {
            return left + right;
        }

        @Fallback
        Object add(Object left, Object right) {
            return convertDouble(left) + convertDouble(right);
        }

        static double convertDouble(Object value) {
            if (value instanceof Number) {
                return ((Number) value).doubleValue();
            } else if (value instanceof String) {
                return Double.parseDouble((String) value);
            }
            throw new RuntimeException("Invalid datatype");
        }

    }

}
